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A new microphone array for aeroacoustic measurements in a cryogenic environment

Ahlefeldt, Thomas and Koop, Lars (2010) A new microphone array for aeroacoustic measurements in a cryogenic environment. Journal of Sound and Vibration, Vol. 329 (22), pp. 4818-4819. Elsevier. doi: 10.1016/j.jsv.2010.06.001.

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Official URL: http://www.elsevier.com


Measurement techniques based on microphone-arrays are well-known and common practice on scaled models in wind tunnels with closed test section. Usually, full-scale Reynolds numbers are not achieved. To increase the Reynolds number measurements are performed in cryogenic and/or pressurized wind tunnels. At the DLR Institute of Aerodynamics and Flow Technology the microphone array measurement technique was further developed to perform measurements in a cryogenic wind tunnel at temperatures down to 100 K. In order to use a microphone array in a cryogenic environment, coming to grips with cold hardiness and ensuring long term stability of the array fairing and the electronic devices, especially the microphones, are the primary challenge. In a first step measurements of the radiated noise from a single rod configuration have been conducted in the cryogenic wind tunnel DNW-KKK using a prototype microphone array designed for cryogenic environment. Measurements were carried out with a wide range of operational flow parameters. The measured sound radiation results showed a very good agreement with theory and a Reynolds number dependency of the measured and predicted sound power was shown.

Item URL in elib:https://elib.dlr.de/62736/
Document Type:Article
Title:A new microphone array for aeroacoustic measurements in a cryogenic environment
AuthorsInstitution or Email of AuthorsAuthor's ORCID iD
Journal or Publication Title:Journal of Sound and Vibration
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In ISI Web of Science:Yes
Volume:Vol. 329
Page Range:pp. 4818-4819
Series Name:Aeroacoustic Research in Europe: The CEAS-ASC Report on 2009 Highlights
Keywords:microphone array measurements, closed test section, cryogenic wind tunnel, airframe noise
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Aeronautics
HGF - Program Themes:Aircraft Research (old)
DLR - Research area:Aeronautics
DLR - Program:L AR - Aircraft Research
DLR - Research theme (Project):L - Concepts & Integration (old)
Location: Göttingen
Institutes and Institutions:Institute of Aerodynamics and Flow Technology > Experimental Methods
Deposited By: Micknaus, Ilka
Deposited On:04 Oct 2010 09:55
Last Modified:10 Jan 2019 15:49

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